Off-Axis Fatigue Behavior and Its Damage Mechanics Modeling for Hybrid Composite GLARE 2.

Kawai, Masamichi; Takumida, K.; Hachinohe, Atsushi; Kawase, Yuko

doi:10.1299/kikaia.64.2847

Cited by 4 publications

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“…Capabilities to describe the static strength dependence and the endurance limit of the off-axis S-N relationships are excluded in the present modeling, since they have not been clearly identified over the range of fatigue life up to 10 6 cycles. These characteristics can be taken into account in the framework of the present modeling [45].…”

Section: Fatigue Life Equationmentioning

confidence: 99%

Off-Axis Fatigue Behavior of Unidirectional Carbon Fiber-Reinforced Composites at Room and High Temperatures

Kawai

Yajima²,

Hachinohe³

et al. 2001

Journal of Composite Materials

139

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High-temperature off-axis fatigue behavior of unidirectional T800H/Epoxy composite has been studied. Effects of different temperature on off-axis fatigue strength are also discussed. Tension-tension fatigue tests are performed at room temperature and 100°C, respectively, on six kinds of off-axis plain coupon specimen. The absolute off-axis fatigue strengths are significantly reduced as the test temperature becomes higher. Irrespective of test temperature, almost linear S-N relationships are obtained for all off-axis angles over the range of fatigue life up to 106 cycles. Normalizing the maximum fatigue stress with respect to the static tensile strength at test temperature, the fatigue data for all off-axis angles eventually fall on a single S-N relationship. It is shown that a theoretical fatigue strength ratio can be defined as a non-dimensional effective stress based on the classical static failure theory and it succeeds in coping with the directional nature of off-axis fatigue strength. A fatigue damage mechanics model is developed using the non-dimensional effective stress, and its capability to describe the off-axis S-N relationship for the unidirectional T800H/Epoxy is demonstrated. Comparisons with the classical fatigue failure models for composites are also presented.

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Section: Fatigue Life Equationmentioning

confidence: 99%

Off-Axis Fatigue Behavior of Unidirectional Carbon Fiber-Reinforced Composites at Room and High Temperatures

Kawai

Yajima²,

Hachinohe³

et al. 2001

Journal of Composite Materials

139

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“…は有機クレイ粒子を，Hussain らはアルミナ粒子をマトリックスに添加することにより，き裂進展時の臨界荷重および，き裂進展初期のモードⅠ層間破壊靭性値が向上したと報告している．しかしながら，ナノスケール強化材をマトリックスに添加する場合，CFRP 積層板の層間の機械的性質の向上効果が高い反面，製造工程が複雑でコストが上昇する等の問題がある．また，ミクロスケール強化材を層間に添加する方法も検討されている．Walker らは短い炭素繊維を，Gilbert らはゴム粒子を，Wang らは炭化ケイ素ウィスカーを層間に添加することにより，き裂進展初期のモードⅠ層間破壊靭性値および，き裂進展過程のモードⅠ層間破壊靭性値が向上したと報告している．また，著者ら (Hu, et al, , 2012b があり，河井ら (Kawai, et al, 1998(Kawai, et al, , 2003は非主軸の非弾性挙動や疲労挙動を扱い，これに及ぼす応力比の影響を検証している．現在では史上最大の旅客機である Airbus A380 の一部に使用されている…”

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Improvement of mode-Ⅱ interface mechanical properties of Al/GFRP composite laminates by VGCF

Azuma¹,

Hu²,

Watanabe³

et al. 2014

Transactions of the JSME (In Japanese)

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Research and development on a composite material named as Fiber-Metal Laminates (FML) for its airplane structural applications have been focused on in recent years. These materials laminate FRP (Fiber Reinforced Plastic) of susceptibility to out-of-plane loads and metal of high impact resistance together to mutually compensating the weaknesses of FRP and metals. To date, a typical one of FML is GLARE (Glass Laminate Aluminum Reinforced Epoxy) which laminates the aluminum alloy (Al) and the Glass-fiber reinforced plastic (GFRP) together. In this work, interlaminar mechanical properties, e.g., fracture toughness, of GLARE are improved by acid treatment to Al and adding Vapor Grown Carbon Fiber (VGCF) between Al and GFRP layers. The influence of VGCF addition and acid treatment on the mechanical properties of GLARE is examined by End Notched Flexure (ENF) tests. On the surface of an Al plate, the "line" induced during rolling manufacturing process appears clearly by acid treatment. Furthermore, VGCF addition amount is changed as 0, 10, 20 and 30 g/m 2 . From the results of ENF tests for Mode-Ⅱ properties, when 10g/m 2 of VGCF are added between Al with acid treatment and GFRP layers in GLARE, critical load (P C ) and critical strain energy release rate in Mode-Ⅱ(G ⅡC ) increase most significantly due to the fiber bridging effect, i.e., 118% and 345%, respectively. The present results also reveal that properly adding VGCF, e.g., 10g/m 2 , has an effect on deterrence of crack growth. However, G ⅡC decreases when the VGCF loading is too high due to poor VGCF dispersion, e.g., 30 g/m 2 here. Moreover, the anisotropy of interlaminar mechanical properties depending on the "line" and fiber directions appears more obviously by adding VGCF.

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Homogenized properties of elastic–viscoplastic composites with periodic internal structures

Ohno

Matsuda

2000

International Journal of Mechanical Sciences

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Off-Axis Fatigue Behavior and Its Damage Mechanics Modeling for Hybrid Composite GLARE 2.

Cited by 4 publications

References 0 publications

Off-Axis Fatigue Behavior of Unidirectional Carbon Fiber-Reinforced Composites at Room and High Temperatures

Off-Axis Fatigue Behavior of Unidirectional Carbon Fiber-Reinforced Composites at Room and High Temperatures

Improvement of mode-Ⅱ interface mechanical properties of Al/GFRP composite laminates by VGCF

Homogenized properties of elastic–viscoplastic composites with periodic internal structures

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